An Apple ID gives you access to several functions on your mobile phone such as iCloud, App Store and iTunes. Before you can activate an Apple ID on your mobile phone you need to set up your mobile phone for internet.
Tap Sign in to your iPhone.
If you don't have an Apple ID, tap Don't have an Apple ID or forgot it? and follow the instructions on the screen to create an Apple ID.
Tap the field next to "Apple ID" and key in the username for your Apple ID.
Tap the field next to "Password" and key in the password for your Apple ID.
Tap Sign In.
Slide your finger upwards starting from the bottom of the screen to return to the home screen.